FULL UMS for data and pictures, you can transfer your songs in UMS but you need in this case "YH-820 Samsung Media Studio 3" and "Recovery Utility" to update library (Only Windows XP compatible softwares , NOT with Vista )

If you want to use UMS mode connection with MTP firmware or if you want to upgrade from a MTP firmware to a UMS firmware, press “ON” on the “HOLD” switch and press “REC” key for a few seconds while connecting to the USB port, then the player will connect in UMS mode.